Injection flask apparatus



1953 A. J. HEINNIKE ET AL 2,660,758

INJECTION FLASK APPARATUS Filed June 14, 1952 2 Sheets-Sheet l I INVENTORSQ V A/v THONY .I ileum/ 5, 66 00 MORE/5 4 0 42.45.81? Am:v Bl M3 Patented Dec. 1, 1953 UNITED STATES PATENT OFFICE INJECTION FLASK APPARATUS Anthony J. Hennike, Gordon Morris. and Elza E. Broady, Phoenix, Ariz.

Application June 14, 1952, Serial No. 293,602

2 Claims. 1

This invention pertains to improvements in injection flask apparatus, and is more particularly directed to improvements in injection flasks for making false teeth plates and the like.

One of the objects of this invention is to provide an improved flask structure containing the mould form which is rigid in construction, is especially adapted to receive the injection pressures, and which may be readily disassembled for quick removal of the mould material at the conclusion of the injection operation.

Still another object of this invention is to provide an improved injection flask having an injection plunger located in the side of a central member and in which there are provided side plate members and a hinge and latch arrangement to facilitate disassembly of the mould materials at the completion of the injection operation while at the same time providing a strong and rigid flask structure.

Still another object of this invention is to provide an improved injection flask apparatus which is especially adapted to the injection and heat treatment of the injected material in the mould while at the same time providing a rapid Further features and advantages of this i-nvention will appear from a detailed description of the drawings in which:

Fig. 1 is a side elevation, partly broken away on the line ll of Fig. 2, showing an injection flask incorporating the features of this invention.

Fig. 2 is a side elevation of the injection flask shown in Fig. 1.

Fig. 3 is an exploded view of the subject matter shown in Figs. 1 and 2.

Fig. 4 is a side elevation of the clamping and pressure plunger actuating apparatus for' the injection flask shown in Figs. 1, 2 and 3.

Fig. 5 is a plan view'of the apparatus shown in Fig. 4.

Fig. 6 is a side elevation of the apparatus shown in Figs. 4 and 5.

Fig. 7 is a fragmentary sectional view on the line 7-1 of Fig. 6.

As exemplary of one embodiment of this invention there is shown an injection flask, Figs. l, 2 and 3, comprising the main central member ID and the two side plate members II and I2. The central member [0 has the hinge top cap piece l3 carried on a suitable hinge pin M on one of the upwardly extending arms l5 of the member H3. The other end of the top cap piece I3 is provided with an abutment surface l6 which engages a mating abutment surface l1 onthe top of the other upwardly extending arm I8-of the central member II]. There is also provided a latching surface 49 engaging down over the surface 20 of the upwardly extending arm l8 so as to secure the arm [8 against any outward springing movementwhen pressure is applied in the flask.

In an upstanding boss 2| formed integral with the top cap piece I3 there is formed a cylinder bore 22 in which nicely slides the injection plunger 23 having the top pressure abutment surface 24. Posing downward pressure on the surface it of the injection plunger 23 is the base or abutment surface 25 which is formed on the bottom portion 26 of the member ID to which the upwardly extending arms I5 and 18 are integrallyformed;

The side surfaces 21 and 28 of the central member I 0 and the surfaces 29 and 30 of its cap piece I3 are accurately machined parallel and are adapted to matingly engage the respective faces 3| of the side plate members H and [2 of theside plate [2, as best seen in Fig. 3. Suitable locating and securing pins 33, 34 and 35 carried inthe members Ill and I3 engage in mating holes 35 formedin each of the side plates II and I2. The pins and holes referred to serve to properly accurately position the side plates II and I2 on'the members |O-I3 and also serve to secure initially the top-cap piece E3 in proper latched position on the member [0.

There is thus formed a cavity 3'! in the central member l0 and its cap piece [3 and mating-cavities 38 and 39 respectively in the side plates, and I2 in which is carried the prepared mould comprising the material positioned at 40 and sup ported in the member lli l3 and side plate I2 and the mould portion 4i secured in the. cavity 38 and to the side'plate ll. Suitable chamfered holes 40a and the tapered surface 31a in therespective members 12 and it serve to hold the mould material 40 rigidly into these portions of the injection flask while similar chamfered openings 38a secure the mould 41 in the side plate 3 member H. A suitable gate or passageway 42 is formed in the mould material 40 and connects with the inner end of the injection cylinder 22. The preparation of the mould material 40 and 4| in the flask as described is done in a well known conventional manner forming no specific part of this invention. Having thus prepared the preliminary mould 4ll4l in the flask as described, the plastic to be inject'd thefebetween is placed in the cylinder 22 and the injection plunger 23 then inserted and forced downwardly to drive the material into the mould 40-41 and thus make the false teeth plate or the like 'lhe prqb le m here involved however is several fold in that the mould must be securely held together with s11; er its respective parts H), II, l2 and I3 rigidly held against any movement when high press urejs applied to the injection plunger 23. It is alsoa problem to heat the flask in boiling water", steam or other heating means to. properly heat treat the plastic. when injected inthemould to, produce the desired finished product. Thirdly, it} is a prob lem to releasethe plunger from its spring. loaded condition .duringsaidheat treating operation. at the conclusion; jofsaide heat treatment. with speed and facility and atthe same time beingable to promptly, and quickly. disassemble. the mould and remove the vfinished product-with va minimum of efiortandtim'e beingmequired.

To. this-end there haszbeen provided in cjo'nnec tionwitlr, thefiask ofthe; design shown ineFigs. 1= thru -3,, a. compression: .and securing apparatus for preparing and hold-ing; the-flask during the heat treating operation ,aHdfon final withdrawal of the injection plungenanddisassembleloftheiflasksat the conclusion of. theheattreating operation, this arrangement be n shown-particularly, inFigs. 4, 5, 6 and 7 heremthereis provided .a- Ueshaped base member comprising the main base .plate member 43 ha;ving,. an, abutmentsurfa e d4 upon which .reststhe base surtaces E2 5;.onithe. bottom of the, flask. Upstanding, integral. standards 45 and 4Bare formed on thabasemember 43 towhich is piv ta y ounted ithe swine-i s .U shared s memberA'l which is., connect. dthru a.pivot pin 48; the. upper end, of. the standardfi. and which is connectedthru aclarnpable pivotal connection 49 having clampin knobi 50'..and-;a hreaded; con nectien 5|;in thestandarde lfi, sothat the knob-.-50 ybe ti ht n d. QQk; the: yok member A! .in any tilte ipQsition onthe standards 45 and 1.416, aee pestbe. sesflinfiiafi:

-T.ie mean comprisi .th .tie .bar .52, best een .in-Eigir -fix d a .=53 and 1.54. to L he upperrear portions of ithestandardsyfli and-r46 s as to prev n -za y. olefiectionv or spreadin .oftheupper ends of heetandardse;and 4.6.o the downwardly proj ting side members 5.5 and 56 of .the yoke member '41. In addition totheflxed t e h m e e is p o ided a demou tab emi ar .for th m pu poseas t bar :52 compr sing the bar member threade ly .eng seabl with .the standard 146 :in :the threaded bore .58 therein .and therotating knob-:59 rigidly -.to" the. rod 51 by a pint-6.0 passing the hub '6f-th'eknQb'5 9 and whieh hubel has an abfitnier'itsur'face-M engaging the outer face -53 6r thastandard is so that when the demountable 4 48-49 of the yoke member 41 with the base member 43.

With the knob loosened and the yoke member 41 swung back to the position 41a and the demountable tie rod 51 removed, one or more of the injection flasks, such as shown in Figs. 1, 2 and 3, may be inserted in the pressure injecting a am i u unit d ssente F 41 5, 6: and '7. The flasks, incluidin'gtl ie irgcentral member H] and the side plates llan'd f2, are provided with cut away slots and 66, the slot 65 hooking around the fixed tie bar 52 as best seen in Figs. 5- .and,;6; s o;as; to enable the flasks to be placed down with their bottom face 25 in firm abutment with'th race 44 of the member as. The de- 'mahmtbie tie rod 51 is then inserted as described 59 nasses th t cut away slot 66 in the flasks. Thus the flasks are held against tipping out of firinresting position on the surface 44 of the base plate 43. A side clamping pressure element comprising a". discttflv carried .ona. clamping. .screWiGB thread'ably mounted at .69 in. the standard .45 1 is then. moved by tightening the screws 68 up against the side of one .o'rmore of the flasks to force them firmly up-against thegabutments'ur face [0 on. the inside of. the .standard:46 soas' tosecure. the. flasks sidewisepositionand also 'toesecure all ef. the

side; plates, i l and. t2. securely to the central them-1 bers IB 'I 3 of the flasks.

The ,im'ecti'oniplungers ;253 are then removed, the plastic injection material inserted-in their respectivecylinders 22..andthe pressure plungers reinserted in the;cylinders zlasbest seen-in Fig. 4. A compression spring] I. is then placed on topof the shoulder 12against.the-abutmentsurface thereof and thegyoke memberzfi-l-rockeli upwardly from its p osition-fia toposition. H'as hOW-H-r mile-.161 0- ine th l ping s r w th-readedly carried ,at -15 in ,the clamping screw bushings 16 secured to the cross member fllof h k .-.4; into alignment w th th plun er :23- Thescrew Hthenistightened down so that its shoulder- 18' has 5 its under side abutment surface nsaeed w h heom es o spr I th screw being tightened until all,of,the-plastic materiale n; the lind l 2 is ully inj nto the men-1 24014 ..and h erew urtheh ti ht to substantially. completely compress the spring 1; l Ifhis .may -be ,done'rior each or any .number gof flasks presented in theapparatus as described.

The entireunit thus .clampedup on the flask with the material injected in the .mould is then subjected to heat treatmentesuch as a water or stream 1 bath .or any other suitable means to maintain the temperature .of the flask at the g se m n emd f h s e e m tor ime.

At the completion of the heat-;treating-.opera tion -it is invariably round ;that the plastic -in the .cylinder -;-22 tends to lock the plunger {23 against easy withdrawal trend :the flaskso that applicant provides a 1 U :shaped pull-out pieceyiifl harm d-H abutmen -face n 2 dap d to a e zin fi e i e zr Q th m mb i= ofthe-plu-nger :25; and-the upper surface 84 :of

the member 18 of the clamping screw -14. 'Ehus- P9 e-h ek gs yup s ra .es l e a u able wrench 85, the plungerwill' be fully with-'- q ew with ea e i em t ts. .resp eti e ln r 521 in the flask I he ,ope tpr ,;then withdraws the demountable e rod :5 .asdescribed, loosensthe side 1 pressure (.plates 8 and; loosens the 550 so as to rock the yoke member 41 back to posi- 99441% wherein-e th barbed-1y removed from under the fi'i'e'd' he bar fiiendiout from the surface 44 of the clamping up mechanism as described.

The side plates of the flasks may now be readily withdrawn by driving a chisel or screw driver in the notched portions 85 and 86 of the side plate members H and I2 to quickly separate them from the center piece ll3. Further, by striking the surface 81 adjacent the latch of the hinge piece [3 it may be quickly swung back out of the way and the remaining portion of the mould quickly knocked out of the flask, cleaned and the plastic dental plate recovered.

It is important to note that the pressure applied by the spring H and the pressure screw 74 reacts on top surface 13 of the injection plunger 23 in such a Way as to apply the force directly down to the center member l0-|3 to the abutment surface 25 of this member and of the side plate members II and I2. In so doing the hinge member I3 is automatically held in latched position with its surface It securely held against the surface I! so as to provide a self interlocking rigid structure during pressure operation. It is also to be noted that by the exertion of side pressure by the screw 68 during the injection and curing operation under heat treatment that all clamp screws have been completely eliminated from the manipulation of the injection flask. The locating pins 33, 34 and 35 are primarily for initial manual location of the side plates with respect to the center member |0--l3 and perform very little if any actual holding of the mould together during the actual pressure application and curing operations.

There has thus been provided an improved injection flask apparatus which is self contained and has forces directed to normally hold the flask in closed condition under pressure application and curing operations.

While the apparatus herein disclosed and described constitutes a preferred form of the invention, it is also to be understood that the apparatus is capable of mechanical alteration Without departing from the spirit of the invention and that such mechanical arrangement and commercial adaptation as fall within the scope of the appendent ms are. ext n e is be eluded he e n.

Having thus fully set forth and described this invention what is claimed and desired to be ob-' tained by United States Letters Patent is 1. An injection flask structure including a base plate, an injection flask supported on said base plate, an injection plunger in top of said flask above said base plate, upright standards each side of base plate, clamp means operable in a direction parallel to said base plate for clamping the sides of said injection flask, tie bar means interconnecting the upper ends of said standards directly above said flask, and a yoke member pivotally mounted on the upper ends of said upright standards including pressure screw means, and resilient spring means interconnected between said pressure screw means and the top of said injection plunger.

2. In an injection flask actuating device including a base plate, upright standards on each end of said base plate, a clamp disc located in a plane perpendicular to said base plate, an actuating screw having an axis of operation parallel to said base plate, tie bar means including a fixed tie bar extending parallel to said base plate and rigidly interconnected with the upper ends of said standards, a demountable tie bar including a manipulating knob and a threaded connection with one of the upper ends of said standards located parallel to said fixed tie bar, a yoke member pivotally mounted on the upper ends of said standards, a cross member interconnecting said yoke members, pressure screws in said cross member, and spring means interconnected between said screws and injection plungers in flasks presented on said base plate.

ANTHONY J. HENNIKE. GORDON MORRIS, ELZA E. BROADY.

References Cited in the file of this patent UNITED STATES PA'I'ENIS Number Name Date 94,323 Lawrence Aug. 31, 1869 1,962,410 Rodin June 12, 1934 2,506,071 David May 2, 1950 a 'weze H r e 

